4 pcs HSS Step Drill Set in Wooden Box
Surface: White Finish or Titanium Coated are available. Item No.: SDT401
Size include: ( Three Flat Shank )
4 - 12mm x 9 step 4 - 20mm x 9 step 4 - 30mm x 14 step 6 - 39mm x 12 step this Size by 3mm increase